How to understand Einstein s theory of relativity that time can be turned back?

In fact, as long as our speed of movement is fast to a certain extent, then the space and time we are in are in a static state, and we can control the change of time.

Time can be turned back, this is not what Einstein said, I think children should know that time cannot be turned back, if time can be turned back, then regret medicine should be available. I'm not afraid to do something wrong.

This is an illusion, because Einstein discovered that when you are still, you can feel the past. Especially at night, there will be brain waves, so this is not a real scene.

Einstein said that time can be turned back, and there may be some repetitive things, such as the transmission of human beings from generation to generation, so it is a microcosm of time going back.

It can be understood that the speed of motion is infinitely close to the speed of light, and time is infinitely close to static, so that time can be reversed, but it is theoretically feasible, but it is even more difficult to practice.

When the speed exceeds the speed of light, it is theoretically possible to go back in time, but there is still no way to verify it.

Albert Einstein is a world-famous physicist, and during his lifetime, he put forward theories and theories such as the theory of relativity and the photoelectric effect, and also won the Nobel Prize in Physics, and is recognized as one of the greatest physicists. His most famous theory is the theory of relativity.

1. Einstein's theory of relativity.

In layman's terms, Einstein's theory of relativity is a dialectic of the concepts of time and space. In the theory of relativity, he proposes that time and space can change and are not immutable. When two conditions are met (1, an inertial frame of reference;2. The speed of light is the ultimate speed), if an object flies at the speed of light, the space will become shorter and the time will slow down, that is, you can see the previous state of the object, and time reversal will occur.

2. The speed of light is the ultimate speed and cannot be exceeded.

When the speed of an object is greater than the speed of light, a time lapse occurs. However, the speed of light is currently recognized as the fastest in the world, and in an inertial frame at rest and motion relative to the light source, the measured speed of light is the same, at 299792458 m s. Such an astonishing speed is equivalent to circling the earth seven or eight times per second.

Therefore, given the current state of technology, no object can travel faster than the speed of light.

3. At present, scientific means cannot prove that time has gone back.

Einstein's theory of relativity is theoretically true and can go back in time, but this is only theoretical, because no scientist has proven it so far. Because reaching the speed of light is a very difficult thing to do. However, with the rapid development of science and technology, we can expect that in the near future, mankind will definitely be able to verify the theory of relativity.

Dear readers, do you think there is a speed faster than the speed of light in this world? Assuming that the time lapse really comes, do you want to go back in time and see who you used to be?

In fact, according to Einstein's theory of relativity, the phenomenon of going back in time does occur if the speed exceeds the speed of light, but no speed can exceed the speed of light, so this phenomenon will not happen.

Because time is determined by motion, the faster the speed of motion, the closer it gets, the slower the change in time, so when the speed exceeds the speed of light, it will go back in time, but according to the theory of relativity, it is impossible for any object to exceed or reach the speed of light.

I think this is how it should be according to the theory of relativity, but the difficulty at the moment is that it is difficult to achieve such a speed.

It doesn't happen, just a holographic projection similar to a movie. Because time doesn't turn back. You are only going to receive the light that should be there, and even if you can exceed the speed of light, you can't live because you are space-free from Earth.

When the speed of light is absolute speed, time is not light, nor pendulum, nor cesium atoms, time is time, and human means of measuring time are these, but unfortunately time does not change because of human measurement. Time is an immutable vector.

The theory of relativity is to tell us that the speed of light in space-time in the universe cannot be exceeded (except for curvature spacecraft), just like you can find the north side at a certain point on the earth, but at the north pole, there is south all around, and there can be no further north. The unsurpassable speed of light shows that time and space are one, and there is no time out of space, and there is no space out of time.

Yes, faster-than-light time reverses, stops when it reaches the speed of light, and slows down when it doesn't. Not only that, the location of things is different, the time is different, the speed is different, and everyone has a different time, etc., which is really different and varied. Albert Einstein was great!

Even if you can exceed the speed of light, you won't be able to see the past! Because the energy of the light of the past has long been absorbed!

Categories: Education, Science, >> Science & Technology.

Problem description: Can people from the past see people who have gone back to the past?

Surely you can't get in touch with historical figures?

It's so boring just to watch.

Parse: Seeing the Past:

You should know that the propagation of light takes time, so if you put a mirror in front of yourself, you can see yourself in the mirror, but this image is actually the light from your own body shining on the mirror and then reflecting into your eyes, the light has gone through a period of time, so in fact what you see is your actions not long ago, of course, this time is very short:

The speed of light c = ** meters per second, assuming you get to the mirror meters.

Then the light goes from you to the mirror, then reflects back, passes through 3 meters, and it takes a billionth of a second.

That is, you are seeing your own movements one billionth of a second ago.

In the same way, if the light on the earth shoots out of the cosmic base and then turns back to the trail under certain conditions, we can see the people and things on the earth in the past, so we can see it, but we can't touch it.

In the same way, we saw distant planets** or whatever, many years ago, except that the light had just reached Earth.

The so-called going back in time is simply not possible, as you can understand, just seeing images of the past, similar to the truth of cars chasing bicycles, people can't participate in it, this can't be considered a time relapse. Time and space are inseparable in space-time, so it is meaningless to talk about time alone, and due to the interference of various factors, the energy of light is lost, so it is uncertain whether it can be preserved and how long it can be preserved.

The so-called reflection ** is a problem that he didn't consider, or should it be said that what he meant was just a theoretical situation, too complicated to deduce. A situation similar to going back in time, for example, the celestial bodies that we observe now at a certain distance cannot see their current situation, the nearest star is the sun, and we see what it looked like more than 8 minutes ago, because the light travels about 8 minutes and 40 seconds from the sun to the earth (if memory serves), the light emitted by the farther celestial bodies takes longer to reach the earth, if we can see far enough, then by the time we observe a celestial body, maybe it has already disappeared, That is to say, the light it emits in time A does not reach space B until time B, and it may have disappeared in space A at time B, at least not what we see in space B. Even though we see it as it looks in time A, we can't say that we are also in time A, so we don't turn back time.

Einstein did not have the principle of going back in time, which was fabricated by later generations based on his theory of relativity. The truth is that you can't turn back time, because, once you turn back, you become a baby and then a fertilized egg and... There will be no more of you.

It is not only light that can be referred to, but also the effect of gravity. There is an example: there are two clocks, the same time, one placed on the ground on the earth and the other on the top of a tower 300 meters above the ground, and after a while, the bell on the top of the tower will be a little faster than the clock on the ground.

This means that gravity distorts time (and space). When the plane of time is distorted by gravity to 180 degrees, time is reversed when it is turned against the past, that is, when the strong gravitational pull cannot escape even light (such as a black hole).

To put it simply, when you're very, very, very fast, when you catch up with the speed of light, you find that everything around you becomes extremely slow, time stops, and then you accelerate to the point where you exceed the speed of light, and you find that you can go back to the old world.

We can't go back in time, because we can't go faster than the speed of light;

We can't go faster than the speed of light, because the matter that can exceed the speed of light goes to the future forever when it is big!

All this is because matter is divided into: faster-than-light matter, matter that reaches the speed of light (light), and matter that is below the speed of light (us).

Long live lucky. This is my new theory.

Newton Bai

The mechanical view of space-time separates time and space, and holds that time passes evenly independently of the world, which is the so-called absolute tolerance of time;

The theory of relativity believes that time and space are related, and they are combined to form a four-dimensional space-time coordinate to participate in the physical process, so time and space are related, and they are no longer common to the whole space.

A typical example is that time slows down around massive objects, as was demonstrated in last year's Interstellar; There is also the saying that high speed will slow down time, and there is a saying that "the clock slows down".

The principle of special relativity (principle of special covariance): all inertial frames of reference are equal, that is, the form of physical laws is the same in any inertial frame of reference. This means that the laws of physics are the same for an observer at rest in a laboratory as for an electron moving at high speed and uniform speed relative to the laboratory.

The principle of invariance of the speed of light: the speed of light in a vacuum is constant in any frame of reference, which can be expressed in geometric language as the world line of photons in space-time is always light-like. It is precisely because of the experimental nature of photons that the International System of Units uses "the distance traveled by light in a vacuum of 1 299,792,458 seconds" to define the unit of length "meter" (meter).

The theory of relativity is useful in two main ways: high-speed motion (a high speed comparable to the speed of light) and a strong gravitational field.

Old Cow (Newton) machine.

The mechanical view of time and space separates time from space and space, and holds that time is independent of the world and passes evenly.

It is the so-called absolute time dao; The theory of relativity believes that time and space are related, and they are combined to form a four-dimensional space-time coordinate to participate in the physical process, so time and space are related, and they are no longer common to the whole space. A typical example is that time slows down around massive objects, as was demonstrated in last year's Interstellar; There is also the saying that high speed will slow down time, and there is a saying that "the clock slows down".

We all know that we look at other galaxies as light hundreds of millions or tens of thousands of years ago, because it takes time for light to travel. When we set off at a speed of more than the speed of light in the direction of the sun, we can see the sun before the eighth minute 23 minutes? The real meaning of going back in time is here, making an assumption that if you take a sip of water now, the person who is on the sun (hypothetically) will only see it after 8 minutes and 23 minutes (if there is a problem, please do not pursue it), when you drink water and immediately rush to the sun at a speed faster than the speed of light, then the light of your action of drinking water has not yet reached the sun, so after a while you will see that you are drinking water, not in the real sense of time rewind.

Clear enough, right? Because the speed of light is 800 million meters per second, and you only set 10,000 meters, so you can't see anything, if you want to think about it deeply, there is a phantom of a A in the place of meters (hypothetical) on A's body, so to see time rewind you have to be far away (you can't see it, with an astronomical telescope), and you can't see it in a near place, if I say something wrong, please say it, don't scold me, my mind is very fragile and I don't know how to ask

First of all, a few points.

Time is a physical quantity that describes the motion of an object on a 4-dimensional axis.

It's not an exact substance, so it can be both a narrow description of an individual and a description of all people.

That is, everybody has their own time, and that time is under the same frequency.

Here's your question.

So A is moving at the speed of light, and time slows down in B's eyes, but A is creating a new time of a different frequency.

I prefer to call him the way of calculating change)

And this is something that does not affect B, who is only an individual.

Then A10 jumps back to 9 a.m., which means that before A's jump, there was already his body under the cliff and there was an hour.

Since A is going back to the past in public time, B can't see A's body, he's going to see A disappear after jumping.

To use an analogy, it's like a group of people racing on a circular track, and one person suddenly turns around and runs back.

So for the audience, it's certain that he runs to the beginning, that is, the end, but the clockwise arrival that should have happened will not appear.

It's counterclockwise, as if a death is certain, but B doesn't see it.

By the way, 9 o'clock in the presence of two A's.